Explosivverdichtung pulvriger Substanzen

High strain rate deformation microstructures of stainless steel 316L by cold spraying and explosive powder compaction

“…The detonation wave grazes the powder container in the axial direction and sends a radial shock wave into the powder. Due to the radial energy input, the shock pressure increases towards the centre [9]. At the investigated areas, the powder is accelerated to velocities between 500 m/s at the outside of the cylindrical ingot and 800 m/s at the centre.…”

“…However, it is possible to give corresponding velocities [14,19], which are given in Table 4. Detailed information on explosive powder compaction can be found in [9][10][11][12]14].…”

“…Because of extremely rapid compression of the powder, dense solids of metals and ceramics can be produced by an appropriate selection of shock pressure and duration [9][10][11][12][13][14]. Particle deformation by the shock wave can be considered as an inverse impact of the compressed and accelerated particles behind the shock front towards the non-compressed and non-moving particles in front of the shock front, as sketched in Fig.…”

Explosive compaction and low-temperature sintering of alumina nanopowders

“…The use of explosive compaction for changing the properties of substances and obtaining new volume materials were considered in [10][11][12][13]. Shock-wave loading was shown to substantially distort the crystal lattice, activate the particle surface, and lead to particle fragmentation, which exerts a favorable effect on the subsequent process of material sintering.…”

Microstructurally-based analysis and computational modeling of shock consolidation

“…The shock consolidation of materials has been reviewed by a number of investigators: Gourdin [1], Prummer [2], Sawaoka [3]. Models that predict the pressure required for consolidation of "soft" materials, based exclusively on the melting of particle surfaces, have ben proposed by Gourdin [4] and Schwarz et al [5].…”